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Accelerated Electron Transfer Between Metal Complexes Mediated by DNA

Purugganan, Michael D. and Kumar, Challa V. and Turro, Nicholas J. and Barton, Jacqueline K. (1988) Accelerated Electron Transfer Between Metal Complexes Mediated by DNA. Science, 241 (4873). pp. 1645-1649. ISSN 0036-8075. doi:10.1126/science.3420416.

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DNA-mediated long-range electron transfer from photoexcited 1,10-phenanthroline complexes of ruthenium, Ru(phen)^(2+)_3, to isostructural complexes of cobalt(III), rhodium(III), and chromium(III) bound along the helical strand. The efficiency of transfer depended upon binding mode and driving force. For a given donor-acceptor pair, surface-bound complexes showed greater rate enhancements than those that were intercalatively bound. Even in rigid glycerol at 253 K, the rates for donor-acceptor pairs bound to DNA remained enhanced. For the series of acceptors, the greatest enhancement in electron-transfer rate was found with chromium, the acceptor of intermediate driving force. The DNA polymer appears to provide an efficient intervening medium to couple donor and acceptor metal complexes for electron transfer.

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Barton, Jacqueline K.0000-0001-9883-1600
Additional Information:© 1988 American Association for the Advancement of Science. 14 April 1988; accepted 26 July 1988. 14 April 1988; accepted 26 July 1988. We thank B. Beme for stimulating discussions regarding the near-neighbor distance distributions. Supported by National Science Foundation and the Army Office of Research.
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Army Research Office (ARO)UNSPECIFIED
Issue or Number:4873
Record Number:CaltechAUTHORS:20160513-104502311
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:67073
Deposited By: Ruth Sustaita
Deposited On:13 May 2016 18:39
Last Modified:11 Nov 2021 00:26

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